For agencies
You win the projects. I deliver them.
When a client needs a web or mobile app built, finished or fixed, bring me in to do the engineering. You keep the client and your margin, and I keep you up to date, so you’re never the one chasing.
Working together
Take on more app work, without hiring.
01
The work goes out under your name
Your client deals with your agency, not me. We agree who talks to them and whose branding goes on the handover, and nothing about the project is published without your permission.
02
A fixed price to build your quote on
You get the price and dates in writing before I start, half up front and half on delivery, so you know your margin. If your client adds something later, I price it first.
03
You’re never chasing an update
You get a project board, preview links and short video walkthroughs as the work happens, ready to pass on to your client.
04
Work your team can take over
The code lives in your client’s accounts, with handover notes your developers can follow, and I fix any bug in my work free for 90 days.
What you can hand over
The same services and prices as my direct clients.
- Web app
From £4,000
Your client’s web app, built from your brief. We agree the features, who supplies the designs and content, and what testing and launch include.
- Mobile app
From £7,000
Your client’s iPhone and Android app, built from your brief, tested on phones and taken through both app stores.
- App completion & launch
From £3,000
Finishing, fixing and launching an app your client has already started, usually over 2–4 weeks, with handover notes for your team.
- Focused repair
£500–£1,000
One problem fixed: a broken user journey, a build or signing failure, or an App Store or Google Play rejection.
Technical fit
The stack I work in.
I build new apps, and finish and fix existing ones, with these tools.
Web: React and Next.js
Web apps, client portals and admin tools, with deployment and rollback instructions.
Mobile: Expo and React Native
iOS and Android apps, builds and signing, App Store and Google Play submission, and review responses.
Backend: Supabase
Postgres, authentication and row-level security, so each user reaches only their own data.
Payments
Checkout and subscriptions, tested for failed payments, webhook retries and duplicate payment events.
Testing
Automated tests for critical user journeys, such as sign-up and checkout.
Monitoring
Error monitoring and product analytics, such as Sentry and PostHog.
Finishing an app usually takes 2–4 weeks, and a new build’s dates are set in its quote. Updates are mostly in writing, with calls on UK evenings and weekends, and there’s no 24/7 cover, so check my availability before you promise your client a start date.
Who does the work
Ahmed Gadir, senior software engineer in London.
I’ve been a software engineer since 2018, much of it on enterprise React platforms. I built and launched my own app, ArabyBuddy, on both stores in 2026, and I’m building RepGarden for a personal trainer, writing up each decision as I make it.
Tell me about the project.
Send the brief or the existing app, what your client needs, the budget and timing, and the stack if it’s chosen. An idea is enough to start.